Fibre-optic sensor and liquid-propellant rocket engine: what they have in common

1. Step 1. Fibre-optic sensor — is made of — Silica (sand). The fibre is silica glass.
2. Step 2. Silica (sand) — is material for — Space Shuttle. The heat-shield tiles are silica fibre.
3. Step 3. Space Shuttle — has part — Liquid-propellant rocket engine. Hydrogen-fuelled main engines.

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